<template>
  <div>
    <div class="box">
      <div class="cropper-box">
        <div class="topBox">
          <div class="cropper">
            <vue-cropper
              ref="cropper"
              :img="option.img"
              :outputSize="option.outputSize"
              :outputType="option.outputType"
              :info="option.info"
              :canScale="option.canScale"
              :autoCrop="option.autoCrop"
              :autoCropWidth="option.autoCropWidth"
              :autoCropHeight="option.autoCropHeight"
              :fixed="option.fixed"
              :fixedNumber="option.fixedNumber"
              :full="option.full"
              :fixedBox="option.fixedBox"
              :canMove="option.canMove"
              :canMoveBox="option.canMoveBox"
              :original="option.original"
              :centerBox="option.centerBox"
              :height="option.height"
              :infoTrue="option.infoTrue"
              :maxImgSize="option.maxImgSize"
              :enlarge="option.enlarge"
              :mode="option.mode"
              @realTime="realTime"
              @imgLoad="imgLoad"
            >
            </vue-cropper>
          </div>
          <!--预览效果图-->
          <div class="show-preview">
            <div :style="previews.div" class="preview">
              <img :src="previews.url" :style="previews.img" />
            </div>
          </div>
        </div>

        <!--底部操作工具按钮-->
        <div class="footer-btn">
          <div class="scope-btn">
            <label class="btn" for="uploads">选择封面</label>
            <input
              type="file"
              id="uploads"
              style="position: absolute; clip: rect(0 0 0 0)"
              accept="image/png, image/jpeg, image/gif, image/jpg"
              @change="selectImg($event)"
            />
            <el-button
              size="mini"
              type="danger"
              plain
              icon="el-icon-zoom-in"
              @click="changeScale(1)"
              >放大</el-button
            >
            <el-button
              size="mini"
              type="danger"
              plain
              icon="el-icon-zoom-out"
              @click="changeScale(-1)"
              >缩小</el-button
            >
            <el-button size="mini" type="danger" plain @click="rotateLeft"
              >左旋转</el-button
            >
            <el-button size="mini" type="danger" plain @click="rotateRight"
              >右旋转</el-button
            >
            <el-button size="mini" type="primary" @click="baocun"
              >保存</el-button
            >
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { VueCropper } from "vue-cropper";
export default {
  name: "adminImgShear",
  components: {
    VueCropper,
  },
  data() {
    return {
      previews: {},
      option: {
        img: "http://oss.mcweb.club/utools/20233/touxiang_160.jpg", //裁剪图片的地址
        outputSize: 1, //裁剪生成图片的质量(可选0.1 - 1)
        outputType: "jpeg", //裁剪生成图片的格式（jpeg || png || webp）
        info: true, //图片大小信息
        canScale: true, //图片是否允许滚轮缩放
        autoCrop: true, //是否默认生成截图框
        autoCropWidth: 230, //默认生成截图框宽度
        autoCropHeight: 150, //默认生成截图框高度
        fixed: true, //是否开启截图框宽高固定比例
        fixedNumber: [1.53, 1], //截图框的宽高比例
        full: false, //false按原比例裁切图片，不失真
        fixedBox: true, //固定截图框大小，不允许改变
        canMove: false, //上传图片是否可以移动
        canMoveBox: true, //截图框能否拖动
        original: false, //上传图片按照原始比例渲染
        centerBox: false, //截图框是否被限制在图片里面
        height: true, //是否按照设备的dpr 输出等比例图片
        infoTrue: false, //true为展示真实输出图片宽高，false展示看到的截图框宽高
        maxImgSize: 3000, //限制图片最大宽度和高度
        enlarge: 1, //图片根据截图框输出比例倍数
        mode: "230px 150px", //图片默认渲染方式
      },
    };
  },
  methods: {
    //初始化函数
    imgLoad(msg) {
      console.log("工具初始化函数=====" + msg);
    },
    //图片缩放
    changeScale(num) {
      num = num || 1;
      this.$refs.cropper.changeScale(num);
    },
    //向左旋转
    rotateLeft() {
      this.$refs.cropper.rotateLeft();
    },
    //向右旋转
    rotateRight() {
      this.$refs.cropper.rotateRight();
    },
    //实时预览函数
    realTime(data) {
      this.previews = data;
    },
    //选择图片
    selectImg(e) {
      let file = e.target.files[0];
      if (!/.(jpg|jpeg|png|JPG|PNG)$/.test(e.target.value)) {
        this.$message({
          message: "图片类型要求：jpeg、jpg、png",
          type: "error",
        });
        return false;
      }

      let reader = new FileReader();
      reader.onload = (e) => {
        let data;
        if (typeof e.target.result === "object") {
          //转化为blob
          data = window.URL.createObjectURL(new Blob([e.target.result]));
        } else {
          data = e.target.result;
        }
        this.option.img = data;
      };
      //转化为base64
      reader.readAsDataURL(file);
    },
    baocun() {
      this.$refs.cropper.getCropBlob((data) => {
        var date = new Date();
        var aLink = document.createElement("a"); // 创建一个a标签
        aLink.download = date.getTime() + "." + data.type.split("/")[1]; // 使用时间戳给文件命名
        aLink.href = URL.createObjectURL(data);
        aLink.click();
      });
    },
  },
};
</script>
<style lang="scss" scoped>
.box {
  background-color: #fff;
  margin: 10px;
  padding: 10px;
  min-height: calc(100% - 20px);

  .cropper-box {
    flex: 1;
    .topBox {
      display: flex;
      .cropper {
        width: 500px;
        height: 300px;
      }
      .show-preview {
        margin-left: 30px;
        .preview {
          overflow: hidden;
          border: 1px solid #67c23a;
          background: #cccccc;
        }
      }
    }
  }

  .footer-btn {
    margin-top: 30px;
    display: flex;
    display: -webkit-flex;
    // justify-content: flex-end;
    .scope-btn {
      display: flex;
      display: -webkit-flex;
      justify-content: space-between;
      padding-right: 10px;
    }
    .upload-btn {
      flex: 1;
      -webkit-flex: 1;
      display: flex;
      display: -webkit-flex;
      justify-content: center;
    }
    .btn {
      outline: none;
      display: inline-block;
      line-height: 1;
      white-space: nowrap;
      cursor: pointer;
      text-align: center;
      -webkit-box-sizing: border-box;
      box-sizing: border-box;
      outline: 0;
      -webkit-transition: 0.1s;
      transition: 0.1s;
      font-weight: 500;
      padding: 8px 15px;
      font-size: 12px;
      border-radius: 3px;
      color: #fff;
      background-color: #409eff;
      border-color: #409eff;
      margin-right: 10px;
    }
  }
}
</style>